The engine braking feature is a useful add-on for customers that tow often or folks that drive down mountain grades. The feature is active when the following conditions are met: in gears 1-8, engine rpm above 2000 rpm, and foot off the accel pedal. While the engine braking is active the turbo vanes are closed more to create higher back pressure in the exhaust manifold. This makes it harder to push exhaust out and that force acts on the pistons to help slow the vehicle down. This helps to reduce the need for vehicle brakes and reduces wear on the brake hardware.

I'm getting ready to order your tune and I'm interested in the exhaust braking, but I have the following questions:

1. Is it noticeably louder as is a normal exhaust brake?
2. What is the decel rate with the exhaust brake activated? I'm curious about this because I tow a 7200lb travel trailer approximately 3,000 miles a year. I think it would be great while towing but think it may be to abrupt when not towing. Mind you, I'm in Indiana, so it's fairly flat.

I can speak from the experience with my truck. There is almost no difference in engine sound other than the typically motor noise of higher RPMs.

While not an incredibly amount of deceleration, it is quite noticeable. It will definitely help reduce the wear on your stock truck brakes while towing. It will also help on steep downhills unladen as well.

It is not abrupt at all. It doesn't work until the conditions are satisfied (first post by GDE). It isn't an instant on type brake. It takes about a 1/4-1/2 second to full ramp up so to speak.